US3645663A
Expired / Lapsed
US
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Photoflash lamp and method of preparing and applying fulminating material
Assignee: GTE Sylvania Inc
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Filing: 1970-12-02
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Granted: 1972-02-29
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Expires: 1990-12-02
Abstract
Abstract A percussive-type photoflash lamp, the primer of which comprises a wire anvil partially coated with fulminating material and coaxially supported within a tube in a manner providing a clearance between the coating of fulminating material and the inner wall of the tube. The fulminating material includes a red phosphorus fuel, a chlorate salt oxidizer, a powder combustible, incandescible metal, and a powdered carbon additive for facilitating propulsion of the powdered metal from the primer tube into the lamp envelope when ignited. The fulminating material is prepared and applied in the following manner: the red phosphorus, powdered metal and powdered carbon area dispersed in water to provide an aqueous slurry; the anvil wire is dipped into this aqueous slurry; the coating is dried; a dissolved chlorate salt solution is prepared; and the coated wire is dipped into the chlorate solution so as to permeate the previously applied coating.
Inventors
- 👤 John W Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:19
CPC Classifications
F; F21; F21K; F21K5/00; F21K5/02; F21K5/023; F21K5/026
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
32 words
The combination of claim 1 in which said chlorate salt is an absorbed oxidizer having a water solubility greater than 15 percent by weight and a cation not catalytically reactive toward phosphorus.
Claim 2
Dependent Claim
38 words
The combination of claim 1 in which said last-mentioned substance consists of powdered carbon or a powdered, nonacidic organic carbon compound which is substantially insoluble in liquid vehicles commonly used in applying said fulminating material to said primer.
Claim 3
Dependent Claim
37 words
The combination of claim 3 in which said powdered carbon or carbon compound comprises not less than 0.1 percent and not more than 10 percent of the dry weight of said fulminating material exclusive of said oxidizer.
Claim 4
Dependent Claim
23 words
The combination of claim 3 in which said fuel is red phosphorus, said oxidizer is sodium chlorate, and said powdered metal is titanium.
Claim 5
Dependent Claim
74 words
The combination of claim 1 in which said primer includes a tube sealed in said end of said envelope and having an exposed segment outside said envelope, and a wire anvil located substantially coaxial within said tube, said fulminating material being a coating on said wire anvil located intermediate its ends and on that segment of said wire anvil located in said exposed segment of said tube but spaced from the inside wall thereof.
Claim 6
Dependent Claim
55 words
The combination of claim 6 in which said fuel is red phosphorus, said oxidizer is absorbed sodium chlorate, said powdered metal is titanium, and said propulsion facilitating substance is powdered carbon or a powdered, nonacidic organic compound which is substantially insoluble in liquid vehicles commonly used in applying said fulminating material to said wire anvil.
Claim 7
Dependent Claim
56 words
The combination of claim 6 in which the dried composition of said fulminating material exclusive of said oxidizer comprises about 69.31 percent titanium, about 27.21 percent red phosphorus, about 1.19 percent hydroxyethyl cellulose, about 0.61 percent magnesium oxide, about 0.60 percent magnesium montmorillonite, about 1.02 percent carbon, about 0.06 percent sulfur, and about 0.01 percent trichlorophenol.
Claim 8
Independent Claim
88 words
The method of preparing fulminating material and applying said fulminating material on a primer anvil wire of a percussive-type photoflash lamp, said method comprising: Preparing a slurry comprising a liquid vehicle, red phosphorus, a powdered combustible, incandescible metal, and powdered carbon or a powdered, nonacidic carbon-containing compound which is substantially insoluble in said liquid vehicle; coating said wire with said slurry; drying said coated wire; and permeating said coating on said wire with a chlorate salt solution containing at least 15 percent by weight of dissolved chlorate salt.
Claim 9
Dependent Claim
38 words
The method of claim 9 in which the step of coating said wire is performed by dipping said wire into said slurry, and the last step is performed by dipping said coated wire into said chlorate salt solution.
Claim 10
Dependent Claim
53 words
The method of claim 9 in which said slurry is prepared by using water as the liquid vehicle, said powdered metal is titanium, and said powdered carbon or carbon compound comprises not less than 0.1 percent and not more than 10 percent of the weight of the materials in said slurry when dried.
Claim 11
Dependent Claim
90 words
The method of claim 10 in which said slurry is prepared by using water as the liquid vehicle and has a dried composition comprising about 69.31 percent titanium, about 27.21 percent red phosphorus, about 1.19 percent hydroxyethyl cellulose, about 0.61 percent magnesium oxide, about 0.60 percent magnesium montomorillonite, about 1.02 percent carbon, about 0.06 percent sulfur, and about 0.01 percent trichlorophenol, and in which said chlorate salt solution is prepared by dissolving sodium chlorate in water to provide an aqueous solution containing about 25 peRcent by weight of said chlorate.
References Cited (Backward Citations)
US2740281A
Cited
US3540818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |